Do you want to be a world renowned apologist, or a world forgotten great thinker? The two are not the same.
I began with a profound enjoyment of apologetics but eventually true scholarship replaced my polemical approach (not that I am a scholar, only that I began to read more scholarly books and less internet chatrooms).
I would suggest a profound knowledge of the fathers and the Middle Ages. Put down Hilaire Belloc and read Etienne Gilson, Marie-Dominique Chenu, Charles Homer Haskins, Dom David Knowles, Jacques Maritain, R.W. Southern, Josef Andreas Jungmann, Theodor Klauser, Karl Rahner, Eduard Schillibeeckx, Henri de Lubac, Yves Congar, Stanley Jaki, Pierre Teilhard de Chardin, Norris Clarke, Louis Olivier Duschenes.
Of course you should still read Chesterton, Waugh, and Greene.
But you might be surprised where this leads you.
Adam